First, let me say that the artwork at display is exceptional and is definetly a big part of why this series has become so popular. I can't deny that the series does look amazing. It's really unique and definetly stands out in the crowd of other GL manga.
However, I can't really recommend this manga in terms of the story. Every chapter is only 4 pages long which already makes it more difficult at telling complex stories, but I don't believe that to be the manga's biggest weakness. The pace of this manga is both extremely fast in smaller scale and extremely slow in the bigger scale at the same time. A lot of the chapters feel episodic and there isn't really a lot of arcs that would span multiple chapters. Because of this, every chapter is a little tidbit of the main characters' life. That is quite a good concept, but to get the point of the chapter across in just four pages, they have to rush a lot. Because of that, a lot of the chapters are over in a blink of an eye and the reader is left wondering what even happend in this chapter.
The dialogue can feel entirely disconnected and often becomes just a word salad that's vaguely related to any given subject. The series itself is also something one could consider a "slow burn". Because of that, and how rambly and fast the chapters are, this is a manga in which nothing ever happens and the little that is happening is often entirely incomprehensive. I honestly can't tell you much about the characters other that they are there. Their personalities are fairly standard in terms of what their archetypes are.
I can't deny that it has some cute moments and the general theme, of both characters growing closer together through their shared love of music is nice, it takes unbearably long to get off the ground. As the title implies, the main love interest, Aya, mistakes the protagonist, Koga, for a guy, and while the audience knows that Koga isn't a guy, it takes an extremely long time, for the women to be open with each other and for that misunderstanding to clear up. It's hard to call this a GL romance if it takes a good few dozen of chapters for the characters to even realize they are both women. In fairness, it's hard to call it romance at all, as they just enjoy each other's pressence but keep all the feelings bottled up and won't talk about being into each other, don't expect more than your standard GL "implied feelings" and "being extremely important for each other but never explicitly romantically".
I'm sure someone could come and say how realistic it is for people not to talk about their emotions because they are awkward, but in the year 2024, I'd love to finally see a series that isn't all about extremely awkward characters that are unable to voice their emotions as that's been plagueing the GL genre for years now. Koga and Aya are not blatantly toxic people, so that's at least a plus over a lot of the other GL series that would either be about unbalanced power dynamics, obssessions and jealousy, or just blatant abuse (the bar is on the floor!).
Ultimately I think this series has good vibes, but because of it's extremely slow pace, incomprehensive dialogue and tropey characters, I can't really recommend this to anybody who likes good romance stories. The GL community is somewhat infamous for hyping up everything that is born in this genre, because of how scarce good yuri is, but we do need to step up our standards in terms of the writing. If you do like cute pictures that you can turn off your brain to, you might enjoy it and I don't mean it in a derogatory way, just be sure you approach this series with the right mindset.
